package com.livecooking;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHelp extends SQLiteOpenHelper {

	public static final String TABLE_FOOD = "Food";
	public static final String TABLE_FOODDETAILS = "FoodDetails";
	public static final String COLUMN_FOOD_ID = "F_ID";
	public static final String COLUMN_FOODDETAILS_ID = "FD_ID";
	public static final String COLUMN_FOOD_NAME = "F_Name";
	public static final String COLUMN_FOOD_IMAGE = "F_Image";
	public static final String COLUMN_FOOD_TYPE = "F_Type";
	public static final String COLUMN_FOOD_BOOKMARK = "F_Bookmark";
	
	public static final String COLUMN_FOODDETAILS_HOWTOMAKE = "FD_HowToMake";
	
	SQLiteDatabase sqliteData;
	
	private final Context myContext;

	private static final String DB_PATH = "/data/data/com.livecooking/databases/";
	private static final String DB_NAME = "LiveCooking.sqlite";
	private static final int DATABASE_VERSION = 1;

	// Câu lệnh SQL khởi tạo Database
//	private static final String DATABASE_CREATE = "create table " + TABLE_FOOD
//			+ "(" + COLUMN_F_ID + " integer primary key autoincrement, "
//			+ COLUMN_F_NAME + " text not null, " + COLUMN_F_IMAGE
//			+ "text not null);";

	public DataBaseHelp(Context context) {
		// Khi khởi tạo đối tượng MySQLiteHelper thì hàm super cần truyền vào
		// tên Database và số hiệu phiên bản database. Trong trường hợp số hiệu
		// phiên bản thay đổi thì hàm onUpgrade sẽ được gọi
		super(context, DB_NAME, null, DATABASE_VERSION);
		this.myContext=context;
	}

	public void createDataBase() throws IOException{
		 
    	boolean dbExist = checkDataBase();
 
    	if(dbExist){
    		//do nothing - database already exist
    	}else{
 
    		//By calling this method and empty database will be created into the default system path
               //of your application so we are gonna be able to overwrite that database with our database.
        	this.getReadableDatabase();
 
        	try {
 
    			copyDataBase();
 
    		} catch (IOException e) {
 
        		throw new Error("Error copying database");
 
        	}
    	}
 
    }
 

	private void copyDataBase() throws IOException{
		 
    	//Open your local db as the input stream
    	InputStream myInput = myContext.getAssets().open(DB_NAME);
 
    	// Path to the just created empty db
    	String outFileName = DB_PATH + DB_NAME;
 
    	//Open the empty db as the output stream
    	OutputStream myOutput = new FileOutputStream(outFileName);
 
    	//transfer bytes from the inputfile to the outputfile
    	byte[] buffer = new byte[1024];
    	int length;
    	while ((length = myInput.read(buffer))>0){
    		myOutput.write(buffer, 0, length);
    	}
 
    	//Close the streams
    	myOutput.flush();
    	myOutput.close();
    	myInput.close();
 
    }

	private boolean checkDataBase(){
		 
    	SQLiteDatabase checkDB = null;
 
    	try{
    		String myPath = DB_PATH + DB_NAME;
    		checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
 
    	}catch(SQLiteException e){
 
    		//database does't exist yet.
 
    	}
 
    	if(checkDB != null){
 
    		checkDB.close();
 
    	}
 
    	return checkDB != null ? true : false;
    }

    public void openDataBase() throws SQLException{
    	 
    	//Open the database
        String myPath = DB_PATH + DB_NAME;
        sqliteData = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
 
    }
 
    @Override
	public synchronized void close() {
 
    	    if(sqliteData != null)
    	    	sqliteData.close();
 
    	    super.close();
 
	}
    
	@Override
	public void onCreate(SQLiteDatabase database) {
 
		
	}

	// Khi phiên bản ứng dụng nâng cấp, database thay đổi thêm trường hoặc bớt
	// trường dữ liệu thì cần viết lệnh cập nhật theo phiên bản ở đây
	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		Log.w(DataBaseHelp.class.getName(), "Upgrading database from version "
				+ oldVersion + " to " + newVersion
				+ ", which will destroy all old data");
		db.execSQL("DROP TABLE IF EXISTS " + TABLE_FOOD);
		onCreate(db);
	}

}
